Machine for winding bobbins

ABSTRACT

A machine for winding a bobbin with contiguous layers having contiguous turns of wire including a freely pivoted oscillating arm for delivering the wire to the bobbin. A pivot shaft on said arm connects the arm to a reversing plate which in turn is connected to a pivot shaft on a frame of the machine. The arm and the frame each carry a wire guide pulley and the pitch circumferences of the guide pulleys are tangent to the axis of the pivot shaft on the arm. The axis of the pivot shaft on the frame is located in a manner that its axis intersects the axis of the bobbin.

United States Patent Inventors George W. Le Compte Rockville, Md.; Charles R. Seeger, Tucson, Ariz. App]. No. 889,114 Filed Dec. 30, 1969 Patented Sept. 14, 1971 Assignee The United States of America as represented by the Secretary of the Army MACHINE FOR WINDING BOBBINS Primary ExaminerGeorge F. Mautz Assistant Examiner-Milton Gerstein Attorneysl*larry M. Saragovitz, Edward J. Kelly, Herbert Ber] and Charles R. Carter ABSTRACT: A machine for winding a bobbin with contiguous layers having contiguous turns of wire including a freely pivoted oscillating arm for delivering the wire to the bobbin. A pivot shaft on said arm connects the arm to a reversing plate which in turn is connected to a pivot shaft on a frame of the machine. The arm and the frame each carry a wire guide pulley and the pitch circumferences of the guide pulleys are tangent to the axis of the pivot shaft on the arm. The axis of the pivot shaft on the frame is located in a manner that its axis intersects the axis of the bobbin.

PATENIED SEPI 4 1911 3.604 647 George W. LeCompte L Charles R. Se er,

INVENT RS.

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MACHINE FOR WINDING BOBBINS BACKGROUND OF THE INVENTION This invention relates to the field of coil winding. Proper behavior of wire winding requires that the wire be delivered to a bobbin at an angle that lags a few degrees behind a line normal to the bobbin at the wire laydown point. The conventional machinery used is relatively complicated and cumbersome in operation. For example, in carriage machinery, the carriage must be driven at a rate to match the progress of the wind with an offset in position made at each end of a layer. The wire from a tower winder is delivered from a pulley placed far enough from the bobbin so that the lag angle is nearly constant from one end of the bobbin to the other and the pulley is shifted from side to side for alternate layers of the winding by a lathe or carriage.

SUMMARY OF THE INVENTION The present invention contemplates a novel freely oscillating balanced arm carrying a pulley to feed the wire to a bobbin. During the winding of a bobbin the balanced arm seeks a position such that the wire feed to the bobbin lies in a plane established by the laydown point and the arms pivot axis. Hence the lag errors due to departure from parallelism can be held to a fraction of a degree.

This invention may be better understood from the following detailed description taken in conjunction with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING The single figure is a perspective view showing the freely oscillating balanced arm assembly.

DESCRIPTION OF THE PREFERRED EMBODIMENT The machine shown in the drawing includes a free oscillating arm wire control device I having a pair of opposite ends. A wire delivery pulley 2 is attached to one end and a balance weight 3 is attached to the opposite end for balancing the arm for free oscillation about a pivot point. The arm has a pivot shaft 4 which provides a pivot connection for the arm to a reversing plate 5 mounted by a pivot shaft 6 in housing 7 on frame 8. Wire guide pulley 9 is mounted on arm 1 and wire guide pulley is mounted on frame 8 in a manner that the pitch circumferences of pulleys 9 and 10 are tangent to the axis of pivot shaft 4. Pivot shaft 6 intersects the axis of shaft 4 at the point of tangency with pulley l0 and shaft 11 deter mines intersection of the axis of shaft 6 with the center of the axis of bobbin 12 for smooth operation of the machine.

Layer-end control pins 13 and 14 located at each end of the bobbin are mounted on switch actuator arms 15 and 16 which are pivotally mounted to blocks 17 and 18. The rotational movement of arms 15 and 16 is limited by stop brackets 19 and 20 to the small movement required to close switch contacts 21 and 22. Solenoids 23 and 24, energized by batteries 25 and 26, control the position of reversing plate 5 by means of rods 27 and 28.

The operation of the machine is follows: Wire 29 is supplied from a wire supply and tension regulator (not shown) and the wire is guided over pulley 10 along the free-arm pivot axis to pulley 9 then up the arm over pulley 2 and finally to the bobbin. As seen in the drawing FIGURE, the wire enters the arm from a position along the pivot axis to prevent any disturbance torque from being placed on the arm. Because the delivery pulley 2 moves in an arc and the surface of the winding move up with winding progress, the parallel condition between the free-arm pivot axis and the desired direction of wire delivery can only be achieved at one point in the winding. However, with reasonable lengths for the free arm and the wire between pulley 2 and the bobbin, the lag-angle errors due to departure from parallelism can be held to a fraction of a degree. As the windin of a layer proceeds, the free arm seeks a position in which e pivot axis and the wire from the arm to the bobbin lie in a common plane. If the wire is moved out of the plane defined by the arm pivot axis and the wire laydown point on the bobbin, a component of the wire tension appears normal to the plane and acts on the end of the free arm tending to rotate the arm about the pivot axis on shaft 4 and maintain the wire parallel to the pivot axis. As the winding progresses from left to right, the free arm moves to the position indicated by reference number 30.

Reversal at the end of each layer is accomplished by movable layer-end control pins 13, 14 which cause the lag angle to build up until a transition occurs. These pins operate switchs 21 or 22 to control solenoid actuators 23, 24 which in turn operate rods 27 or 28, depending upon which switch is operated, to shift reversing plate 5. Because the free arm is balanced to prevent gravity torque disturbance, the translational acceleration of the arm resulting from shifting the baseplate to change the lag angle does not cause any rotation of the free arm. Because the bobbin is located directly above the baseplate pivot, the reversal of lag angle is accomplished with very little change in the angular position of the free arm 1. The reversing plate position for winding from right to left is indicated by reference number 31, and the initial arm position for this mode is indicated by reference number 32.

We claim:

1. A machine for winding a bobbin with contiguous layers having contiguous turns of wire comprising: an oscillating arm wire control device for delivering the wire to the bobbin, said arm having a pair of opposite ends, a wire delivery pulley attached to one of said ends, a balance weight attached to the other of said ends, a guide pulley attached to said arm and a pivot shaft projecting from said arm, a reversing plate having one end connected to said pivot shaft and an opposite end connected to a second pivot shaft, and a frame on said machine mounting said second pivot shaft and a second guide pulley in a manner that the pitch circumferences of said guide pulleys are tangent to the axis of said first pivot shaft, the axis of the second pivot shaft intersects the axis of the bobbin and is tangent to the axis of said second guide pulley for smooth operation of the machine.

2. A machine as set forth in claim 1 further including layerend controls for positioning said reversing plate.

3. A machine as set forth in claim 2 with said layer-end controls including a pair of switch contacts having respective control pins secured thereto for engaging the wire at opposite ends of the layers to reverse the operation of said arm. 

1. A machine for winding a bobbin with contiguous layers having contiguous turns of wire comprising: an oscillating arm wire control device for delivering the wire to the bobbin, said arm having a pair of opposite ends, a wire delivery pulley attached to one of said ends, a balance weight attached to the other of said ends, a guide pulley attached to said arm and a pivot shaft projecting from said arm; a reversing plate having one end connected to said pivot shaft and an opposite end connected to a second pivot shaft, and a frame on said machine mounting said second pivot shaft and a second guide pulley in a manner that the pitch circumferences of said guide pulleys are tangent to the axis of said first pivot shaft, the axis of the second pivot shaft intersects the axis of the bobbin and is tangent to the axis of said second guide pulley for smooth operation of the machine.
 2. A machine as set forth in claim 1 further including layer-end controls for positioning said reversing plate.
 3. A machine as set forth in claim 2 with said layer-end controls including a pair of switch contacts having respective control pins secured thereto for engaging the wire at opposite ends of the layers to reverse the operation of said arm. 